Antony did outstanding sound stuff in FMC. The pitch was linked to the hover vehicle physics model, and had a per entity reverb effect (not sure what you call it when the noise bounces off of other objects on a per entity basis.
*evil grin* been playing with that, [edit] sorry... secret i want to keep here....
well, just dont try to loop a sound and change its pitch as its looping.. blitz creates little 'sound artifacts' that you will hear :-(
Not if you do it right and use the proper tools. At least, my engine didnt do it?